216688206869111 has 2 divisors, whose sum is σ = 216688206869112. Its totient is φ = 216688206869110.

The previous prime is 216688206869011. The next prime is 216688206869137. The reversal of 216688206869111 is 111968602886612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 216688206869111 - 2³⁸ = 216413328962167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (216688206869011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108344103434555 + 108344103434556.

It is an arithmetic number, because the mean of its divisors is an integer number (108344103434556).

Almost surely, 2^{216688206869111} is an apocalyptic number.

216688206869111 is a deficient number, since it is larger than the sum of its proper divisors (1).

216688206869111 is an equidigital number, since it uses as much as digits as its factorization.

216688206869111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23887872, while the sum is 65.

The spelling of 216688206869111 in words is "two hundred sixteen trillion, six hundred eighty-eight billion, two hundred six million, eight hundred sixty-nine thousand, one hundred eleven".